I have created a private network of ethereum block chain. The network is open for anybody to join and run their own node.
But I dont want them to mine blocks. I Want to restrict mining to certain nodes.
Any lead is appreciated.
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There are Proof of Authority (PoA) consensus algorithms for parity and geth. With PoA you can explicitly specify who is allowed to mine/seal blocks.
For a step-by-step guide for geth's clique PoA, see https://hackernoon.com/setup-your-own-private-proof-of-authority-ethereum-network-with-geth-9a0a3750cda8